What memory card to take for a book?

Question

Memory cards

For an e-book on Android, I want to buy an 8GB memory card, I met mentions that class 10 cards on communicators and books slow down, or even refuse to work at all: they are designed for cameras and camcorders, that is, for fast work with large files. I will have fb2 (hundreds of kilobytes), pdf (the first tens of megabytes), dictionaries, as well as caches of some android applications on my card. Plus, I intend to carry the entire library with me, and not just the current reading (I like to put it on the shelves), that is, building file lists is more important than a quick complete download of a single book.
Under these conditions, is it worth taking a microSD class 6? or even class 4?

Answer 1

I think that the speed of the card is unimportant for this situation. Reader applications will make a cache, the only brake is turning pages in PDF (but there is almost no difference - it still slows down on pages with pictures)